White Line Erase - Ricoh B121 Service Manual

White Line Erase

The white line erase feature is validated (default) when you specify a value other
than "0" in SP4-941-001. This feature works as follows:
1) The copier scans the original.
2) The density level of each pixel is compared with its adjacent pixels.
3) If the density level of a pixel is extremely lower then adjacent pixels, the level
is corrected. The density levels of the adjacent pixels are considered.
When you validate the white line erase feature, the feature works for all originals.
This feature erases the white lines of 1- through 6-pixel width (approximately, up to
0.25 mm). The white lines that exceed this width are not erased.
When you specify "2," instead of "1," in SP4-941-001, the feature erases darker
white lines (namely, less whiter lines). Note that this SP does not affect the width of
white lines to be erased.
Black Line Erase
The black line erase feature is the function that erases black lines made by the
dust or dirt on the exposure glass. The feature is validated (default) when you
specify a value other than "0" in SP4-942-001.
When you specify a larger value in this SP, the feature erases weaker black lines
(namely, less blacker lines). This SP also affects the width of black lines to be
erased. If you specify "1" or "2," the feature erases the black lines of 1- through 4-
pixel width (approximately, up to 0.17 mm); if you specify "3," the feature erases
the black lines of 1- through 6-pixel width (approximately, up to 0.25 mm). Note that
some black lines on the original may be erased when you specify a larger value in
the SP.
SM 6-21 B121 Series/B259 Series
IMAGE PROCESSING